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Originally Posted by sparksandtabs
what do you mean you hook up to the GPS's TTL port? Is it a TTL serial port?
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The Garmin 18-5Hz GPS unit has a RS-232 output designed to be plugged into a computer or mC of your choice. We used an RS-232 to TTL adapter and piped the NEMA strings into the MiniRC. Is this what you were asking?
On the software side, we used code from Kevin Watson's FRC Code Repository as a base-line for our I/O functions. Both the RS-232 and TTL ports on the MiniRC can be used to input or output data.